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参数资料
| 型号： | TPA711D |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 音频／视频放大 |
| 英文描述： | 0.35 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8 |
| 封装： | GREEN, PLASTIC, MS-012AA, SOIC-8 |
| 文件页数： | 16/38页 |
| 文件大小： | 973K |
| 代理商： | TPA711D |
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TPA711
700mW MONO LOW VOLTAGE AUDIO POWER AMPLIFIER
SLOS230D NOVEMBER 1998 REVISED OCTOBER 2002
23
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
application schematic
Figure 51 is a schematic diagram of a typical handheld audio application circuit, configured for a gain of
10 V/V.
Audio
Input
Bias
Control
VDD
6
5
7
VO+
VDD
3
1
2
4
BYPASS
IN
SE/BTL
VDD/2
CI
0.47
F
RI
10 k
CS
1
F
CB
2.2
F
RF
50 k
SHUTDOWN
VO8
GND
From System Control
CF
5 pF
CC
330
F
1 k
100 k
VDD
100 k
+
+
0.1
F
Figure 51. TPA711 Application Circuit
The following sections discuss the selection of the components used in Figure 51.
component selection
gain setting resistors, RF and RI
The gain for each audio input of the TPA711 is set by resistors RF and RI according to equation 5 for BTL mode.
(5)
BTL gain
+* 2
R
F
R
I
BTL mode operation brings about the factor 2 in the gain equation due to the inverting amplifier mirroring the
voltage swing across the load. Given that the TPA711 is a MOS amplifier, the input impedance is very high;
consequently input leakage currents are not generally a concern, although noise in the circuit increases as the
value of RF increases. In addition, a certain range of RF values is required for proper start-up operation of the
amplifier. Taken together it is recommended that the effective impedance seen by the inverting node of the
amplifier be set between 5 k
and 20 k. The effective impedance is calculated in equation 6.
(6)
Effective impedance
+
R
F
R
I
R
F )
R
I
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相关代理商/技术参数 |
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| TPA711DG4 | 功能描述:音频放大器 Mono Class-AB w/Mono Hdphone Drive RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA711DGN | 功能描述:音频放大器 Mono Class-AB w/Mono Hdphone Drive RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA711DGNG4 | 功能描述:音频放大器 Mono Class-AB w/Mono Hdphone Drive RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA711DGNR | 功能描述:音频放大器 700mW Lw V Audio RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
| TPA711DGNRG4 | 功能描述:音频放大器 Mono Class-AB w/Mono Hdphone Drive RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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